# AI Agent

> Configure AI agents via the imperative SDK / REST API — for no-code dashboard setups, webhook-based tools, and knowledge bases.

- Skill: `zavudev/ai-agent` (Agent Skill)
- Install (CLI): `npx skillmds add zavudev/ai-agent`
- Raw SKILL.md: https://api.skillmd.com/api/skills/zavudev/ai-agent/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: zavudev (https://skillmd.com/u/zavudev)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/zavudev/ai-agent

---


# AI Agent

## When to Use

Use this skill when the user wants to configure AI agents through **API calls** (no source files, no deploy step) — typically from a dashboard or a backend script that creates/updates the agent imperatively.

If the user wants a **code-first agent with custom tool handlers** in TypeScript, deployed via the `zavu` CLI, route them to the **`functions`** skill instead. That path is more ergonomic, version-controlled, and has built-in deployment + debugging.

**Quick routing:**

| User says… | Use |
|---|---|
| "I want my agent's tool to query my database" / "I want to write the tool handler in code" / `defineTool` / `npx zavudev deploy` | `functions` skill |
| "Set up an agent that calls a webhook on my server" / "Configure from the dashboard" / "Create an agent via API" | this skill |
| "I'm starting from scratch and want the simplest path" | `functions` skill (recommended default) |

The imperative API documented here is fully supported and won't be deprecated, but Functions is the recommended path for most new integrations.

## Senders vs accounts (one paragraph)

A **Sender** is the API handle you pass as `Zavu-Sender`; **accounts** (a WhatsApp Business Account, a Facebook Page, a Telegram bot, a phone number) are the connections it routes — and what bills. Senders are free. Connecting an account in the dashboard auto-creates its sender; find it with `GET /v1/senders` and trust its `channels` array for what it can send. See the `channel-setup` skill for the full model.

## Architecture

```
Inbound message -> Flow check (keyword match, or an `always` flow?)
                     -> YES: Execute flow steps
                     -> NO: LLM call with system prompt + context + KB
                -> Agent generates response -> Send reply
```

## Two ways to build one

**As code, with `defineAgent`.** The agent lives in a Zavu Function, next to the
tools it calls, and `npx zavudev deploy` reconciles it. Prefer this when the agent has
tools, when it should be reviewable in a pull request, or when it is part of an
app you already deploy. See the `functions` skill for the full shape.

```typescript
import { defineAgent, defineTool } from "@zavudev/functions"

export const support = defineAgent({
  name: "Customer Support",
  senderId: process.env.SENDER_ID!,
  provider: "zavu",
  model: "deepseek/deepseek-v4-flash-0731",
  // `prompt` here, `systemPrompt` over the REST API. The two paths name this
  // field differently and only `prompt` compiles against @zavudev/functions.
  prompt: "You are a helpful support agent for Acme Corp. Be concise.",
  tools: [orderStatus],
})
```

Deploy it with `npx zavudev deploy`. The reconcile output names every agent and
tool it created or updated, so read it rather than assuming: a deploy can
succeed while the declarations fail to sync, and it says so when that happens.

**Through the API**, shown below. Prefer this for one-off setup, for agents
managed by a dashboard you are building, or when there is no function to attach
the agent to.

Whichever you pick, an agent is created **disabled**. It answers nothing until
you enable it.

## Create Agent

Each sender can have one agent:

```typescript
const result = await zavu.senders.agent.create({
  senderId: "snd_abc123",
  name: "Customer Support",
  provider: "openai",
  model: "gpt-4o-mini",
  systemPrompt: "You are a helpful customer support agent for Acme Corp. Be friendly, concise, and helpful. If you don't know the answer, say so.",
  apiKey: process.env.PROVIDER_API_KEY,
  contextWindowMessages: 10,
  includeContactMetadata: true,
  triggerOnChannels: ["sms", "whatsapp"],
  triggerOnMessageTypes: ["text"],
});
console.log(result.agent.id); // agent_xxx
```

**Python:**
```python
result = zavu.senders.agent.create(
    sender_id="snd_abc123",
    name="Customer Support",
    provider="openai",
    model="gpt-4o-mini",
    system_prompt="You are a helpful customer support agent...",
    api_key=os.environ["PROVIDER_API_KEY"],
)
```

**Go:**
```go
result, err := client.Senders.Agent.Create(context.TODO(), zavudev.AgentCreateParams{
    SenderID:     zavudev.String("snd_abc123"),
    Name:         zavudev.String("Customer Support"),
    Provider:     zavudev.String("openai"),
    Model:        zavudev.String("gpt-4o-mini"),
    SystemPrompt: zavudev.String("You are a helpful customer support agent..."),
    APIKey:       zavudev.String(os.Getenv("PROVIDER_API_KEY")),
})
```

**Ruby:**
```ruby
result = client.senders.agent.create(
    sender_id: "snd_abc123",
    name: "Customer Support",
    provider: "openai",
    model: "gpt-4o-mini",
    system_prompt: "You are a helpful customer support agent...",
    api_key: ENV["PROVIDER_API_KEY"],
)
```

**PHP:**
```php
$result = $client->senders->agent->create([
    'senderId' => 'snd_abc123',
    'name' => 'Customer Support',
    'provider' => 'openai',
    'model' => 'gpt-4o-mini',
    'systemPrompt' => 'You are a helpful customer support agent...',
    'apiKey' => getenv('PROVIDER_API_KEY'),
]);
```

## Provider & Model Selection

| Provider | Models | API Key Required |
|----------|--------|-----------------|
| `openai` | `gpt-4o`, `gpt-4o-mini`, `gpt-4-turbo` | Yes |
| `anthropic` | `claude-3-5-sonnet`, `claude-3-haiku` | Yes |
| `google` | `gemini-1.5-pro`, `gemini-1.5-flash` | Yes |
| `mistral` | `mistral-large`, `mistral-small` | Yes |
| `zavu` | Zavu-hosted models | No (included) |

## Update & Toggle Agent

```typescript
// Update configuration
await zavu.senders.agent.update({
  senderId: "snd_abc123",
  systemPrompt: "Updated prompt...",
  temperature: 0.7,
  maxTokens: 500,
});

// Enable/disable
await zavu.senders.agent.update({
  senderId: "snd_abc123",
  enabled: false,
});
```

## Voice

The agent can also answer and place **phone calls** through Zavu's co-located voice network (speech recognition, the agent's LLM, and speech synthesis, with real-time interruption handling). The `systemPrompt`, tools, and knowledge bases all apply on a call — voice just adds a spoken channel on top. For a code-first voice agent declared in TypeScript, use the `functions` skill instead.

**Requirements**

- The Voice Agents feature must be enabled for your team (call endpoints return `403` otherwise).
- The agent must have `voice.enabled: true`.
- **The sender must have the voice channel on.** An agent with a voice on a sender that cannot take calls looks configured and never rings. The sender needs a phone number your project owns, plus `enableVoice`:
  ```bash
  npx zavudev senders update snd_abc123 --enable-voice
  ```
  Confirm with `npx zavudev senders get snd_abc123`: `channels` must contain `voice`. That array is computed from the sender's real configuration, so it is the answer, not a stored flag.
- Not available with test-mode keys — use a live (`zv_live_...`) key.
- Calls are billed per connected minute plus telephony, deducted from your prepaid balance.

### Enable voice on an agent

Voice lives under the agent's `voice` object on `POST`/`PATCH /v1/senders/{senderId}/agent`. The SDK does not type the `voice` field yet, so set it over REST:

```bash
curl -X PATCH https://api.zavu.dev/v1/senders/snd_abc123/agent \
  -H "Authorization: Bearer $ZAVU_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "voice": {
      "enabled": true,
      "greeting": "Hi, thanks for calling Acme. How can I help you today?",
      "language": "en",
      "ttsVoiceId": "aura-2-thalia-en",
      "interruptible": true,
      "maxCallDurationMinutes": 15,
      "maxIdleSeconds": 30,
      "voicemailAction": "hangup",
      "transferPhoneNumber": "+14155551234"
    }
  }'
```

| Field | Description |
|-------|-------------|
| `enabled` | Whether the agent handles calls. Required. When false, its number is not answered and outbound calls are rejected. |
| `greeting` | Opening line spoken when the call connects (max 1000). If omitted, the agent waits for the caller to speak first. |
| `language` | BCP-47 code for recognition and synthesis (e.g. `en`, `es`, `pt-BR`). Auto-detected from the recipient when omitted. |
| `ttsVoiceId` | Voice used for synthesis. List the ids with `npx zavudev agents voices` (or `GET /v1/agents/voices`); a name that is not in that list is ignored. Neutral default when omitted. |
| `interruptible` | Caller can barge in while the agent is speaking. Default `true`. |
| `maxCallDurationMinutes` | Hard call-length cap, 1-120. Default 15. |
| `maxIdleSeconds` | Silence before the agent ends the call, 5-300. Default 30. |
| `voicemailAction` | On an answering machine (outbound): `hangup` or `leave_message`. Default `hangup`. |
| `voicemailMessage` | Spoken when `voicemailAction` is `leave_message` (max 1000). Falls back to `greeting`. |
| `transferPhoneNumber` | E.164 number the agent can transfer the call to. Setting it gives the agent a transfer tool. |

Once enabled, the sender's number answers inbound calls automatically.

### Place an outbound call

The SDK has a `calls` resource since `@zavudev/sdk` 0.56.0. `to` is the only required field; `senderId` defaults to the project's default sender (whose agent must have voice enabled).

```ts
const { call } = await zavu.calls.create({
  to: "+56912345678",
  senderId: "snd_abc123",
  greeting: "Hi, this is Acme calling about your appointment.",
  maxDurationMinutes: 10,
  metadata: { campaign: "appointment_reminders" },
})
```

Over REST (or on an older SDK):

```bash
curl -X POST https://api.zavu.dev/v1/calls \
  -H "Authorization: Bearer $ZAVU_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+56912345678",
    "senderId": "snd_abc123",
    "greeting": "Hi, this is Acme calling about your appointment.",
    "maxDurationMinutes": 10,
    "metadata": { "campaign": "appointment_reminders" }
  }'
```

Returns `202` with the call object as it starts dialing. `greeting` and `maxDurationMinutes` override the agent's config for this call only.

### Fetch a call and its transcript

SDK: `zavu.calls.retrieve(callId)` (includes the transcript), `zavu.calls.list({ status, direction })` (auto-paginating), `zavu.calls.hangup(callId)`. Over REST:

```bash
# Single call, including the ordered transcript
curl https://api.zavu.dev/v1/calls/call_abc123 \
  -H "Authorization: Bearer $ZAVU_API_KEY"

# List recent calls (filter by status / direction)
curl "https://api.zavu.dev/v1/calls?direction=outbound&status=completed&limit=50" \
  -H "Authorization: Bearer $ZAVU_API_KEY"

# Hang up an active (ringing or in-progress) call
curl -X POST https://api.zavu.dev/v1/calls/call_abc123/hangup \
  -H "Authorization: Bearer $ZAVU_API_KEY"
```

The transcript is a list of turns, each `{ seq, role, text }` where `role` is `user`, `assistant`, or `tool`. It is included when fetching a single call and omitted from the list. `durationSeconds`, `endReason`, `turnCount`, and `cost` populate once the call ends.

## Addressing an agent

Tools, flows and knowledge bases are reachable two ways, and they are the same
resource:

```
/v1/senders/{senderId}/agent/tools     via the sender that answers with it
/v1/agents/{agentId}/tools             via the agent itself
```

Use the agent-scoped form when the agent has no sender yet, which is what
`POST /v1/agents` creates. The sender-scoped form cannot address it, so an
agent you were told to assemble standalone used to be un-assemblable.

```bash
AGENT=$(curl -s -X POST https://api.zavu.dev/v1/agents \
  -H "Authorization: Bearer $ZAVUDEV_API_KEY" \
  -d '{"name":"Ada","provider":"zavu","model":"openai/gpt-4o-mini","systemPrompt":"..."}' \
  | jq -r .agent.id)

curl -X POST https://api.zavu.dev/v1/agents/$AGENT/tools -d '{...}'
curl -X POST https://api.zavu.dev/v1/agents/$AGENT/knowledge-bases -d '{...}'
curl -X POST https://api.zavu.dev/v1/agents/$AGENT/senders -d "{\"senderId\":\"$SENDER_ID\"}"
curl -X PATCH https://api.zavu.dev/v1/agents/$AGENT -d '{"enabled":true}'
```

## Conversational Flows

Flows handle structured conversations (keyword triggers, data collection):

```typescript
const result = await zavu.senders.agent.flows.create({
  senderId: "snd_abc123",
  name: "Lead Capture",
  description: "Capture lead information from interested prospects",
  trigger: {
    type: "keyword",
    keywords: ["info", "pricing", "demo"],
  },
  steps: [
    {
      id: "welcome",
      type: "message",
      config: { text: "Thanks for your interest! Let me get some info." },
      nextStepId: "ask_name",
    },
    {
      id: "ask_name",
      type: "collect",
      config: { variable: "name", prompt: "What's your name?" },
      nextStepId: "ask_email",
    },
    {
      id: "ask_email",
      type: "collect",
      config: { variable: "email", prompt: "What's your email?" },
      nextStepId: "confirm",
    },
    {
      id: "confirm",
      type: "message",
      config: { text: "Thanks {{name}}! We'll reach out at {{email}}." },
    },
  ],
  enabled: true,
  priority: 10,
});
```

### Trigger Types

| Type | Description |
|------|-------------|
| `keyword` | Matches specific keywords in message |
| `always` | Runs on every inbound message not already inside a flow |

`intent` and `manual` are accepted by the API and stored on the flow, and the
matcher has no branch for either: a flow created with one never triggers, and
nothing reports that. Use `keyword` or `always`.

A `transfer` step sends its message, marks the session transferred, and
**silences the agent for that contact** until a person answers. Their messages
still arrive and show in the inbox; the agent just stops replying. Any outbound
message you send them ends the handoff and the agent resumes. Nobody is notified
for you, though: `notifyWebhook` and `reason` are accepted and never read, so put
a `tool` step before the transfer if your team needs a ping.

A `collect` step's `date` validation accepts any text including `tomorrow`. Constrain a date with `choice`, or
validate it in your own tool.

Flow sessions do not expire. A contact who stops answering halfway resumes at
the same step whenever they write again, with the variables they had.

### Step Types

| Type | Description |
|------|-------------|
| `message` | Send a message |
| `collect` | Collect user input into a variable |
| `condition` | Branch based on conditions |
| `tool` | Call a webhook tool |
| `llm` | Make an LLM call |
| `transfer` | Transfer to human agent |

### The `tool` step, and the field that looks like an id

```typescript
{
  id: "save_lead",
  type: "tool",
  config: {
    toolName: "create_lead",   // the tool's name, or its id
    action: "call",
    params: { email: "{{email}}", source: "whatsapp" },
    storeResultAs: "lead",
  },
  nextStepId: "confirm",
}
```

`config.toolId` is the original spelling and still works. Either field is
accepted, and either one may hold the tool's name or its id: `toolId` was read
as a name for a long time while the dashboard wrote real ids into it, so both
shapes exist in the wild and both resolve.

Values wrapped in `{{ }}` are replaced with data collected earlier in the flow;
anything else is passed through literally. Omit `params` for a tool that takes
none. The tool must already exist on the agent before the flow runs.

A step pointing at a tool the agent does not have ends the session as
**abandoned** and logs the misconfiguration. It is not counted as a completed
flow, and nothing is said to the contact: the plain agent picks the conversation
up from their next message.

### Flow Operations

```typescript
// List flows
const flows = await zavu.senders.agent.flows.list({ senderId: "snd_abc123" });

// Update flow
await zavu.senders.agent.flows.update({
  senderId: "snd_abc123",
  flowId: "flow_abc123",
  enabled: false,
});

// Duplicate flow
await zavu.senders.agent.flows.duplicate({
  senderId: "snd_abc123",
  flowId: "flow_abc123",
  newName: "Lead Capture (Copy)",
});

// Delete flow
await zavu.senders.agent.flows.delete({
  senderId: "snd_abc123",
  flowId: "flow_abc123",
});
```

## Booking skills you do not have to build

`check_availability` and `book_meeting` are hosted by Zavu: no endpoint, no
hosting, no secret. They read and write one calendar per project (Cal.com or
Google Calendar), and they behave identically on a call and in a thread.

They are added from the dashboard, in the agent's **Tools** tab under
**Library**, along with the calendar connection itself. There is no REST or SDK
surface for them yet, so do not tell a user to add one with the API.

What matters when a booking agent uses them: `book_meeting` only reports a
booking when the calendar accepted it. A Cal.com event type that requires
confirmation answers `pending`, and the skill tells the agent to say the time is
held but not confirmed. Never write a prompt that instructs the agent to
announce a confirmation before the tool result says so.

## Webhook Tools

Tools let the agent call your backend during conversations.

> **Which channels call them: all of them.** Tools are offered to the model on
> voice, on plain text (WhatsApp, SMS, Telegram, email), and inside a flow's
> `tool` step. All three dispatch through the same executor, so a tool cannot
> behave differently per channel. The model may chain up to five tool rounds in
> one reply, and you are billed for the tokens the whole loop uses.
>
> Reach for a flow when the sequence must be deterministic, not because text
> cannot call tools. It can.
>
> Verify per execution rather than assuming: `toolCalls: 0` on an agent that has
> tools means it answered without calling any, which is the case where the reply
> says "let me check that" and nothing happened.

```typescript
const result = await zavu.senders.agent.tools.create({
  senderId: "snd_abc123",
  name: "get_order_status",
  description: "Get the current status of a customer order",
  webhookUrl: "https://api.example.com/webhooks/order-status",
  webhookSecret: process.env.WEBHOOK_SECRET,
  parameters: {
    type: "object",
    properties: {
      order_id: { type: "string", description: "The order ID to look up" },
    },
    required: ["order_id"],
  },
});

// Test tool
await zavu.senders.agent.tools.test({
  senderId: "snd_abc123",
  toolId: "tool_abc123",
  testParams: { order_id: "ORD-12345" },
});
```

## Knowledge Bases (RAG)

A prompt that says "only state what the documentation returns" with no documents
attached does not refuse — it invents. Attach the documents, then verify with
`agents test`, which reports how many chunks it actually retrieved.

From the CLI:

```bash
npx zavudev agents knowledge-bases create --sender snd_abc123 --name "Product docs"
npx zavudev agents knowledge-bases documents add --sender snd_abc123 --kb <kbId> \
  --title "Pricing" --content-file ./pricing.md
npx zavudev agents knowledge-bases documents list --sender snd_abc123 --kb <kbId>
```

Processing takes a few seconds; `isProcessed` flips to true and `chunkCount`
fills in.


Add documents for the agent to reference via retrieval-augmented generation:

```typescript
// Create knowledge base
const kb = await zavu.senders.agent.knowledgeBases.create({
  senderId: "snd_abc123",
  name: "Product FAQ",
  description: "Frequently asked questions about our products",
});

// Add document
await zavu.senders.agent.knowledgeBases.documents.create({
  senderId: "snd_abc123",
  kbId: kb.knowledgeBase.id,
  title: "Return Policy",
  content: "Our return policy allows returns within 30 days of purchase...",
});

// List documents
const docs = await zavu.senders.agent.knowledgeBases.documents.list({
  senderId: "snd_abc123",
  kbId: kb.knowledgeBase.id,
});
```

## Monitoring

```typescript
// Get agent stats
const stats = await zavu.senders.agent.stats({ senderId: "snd_abc123" });
console.log(`Invocations: ${stats.totalInvocations}`);
console.log(`Tokens: ${stats.totalTokensUsed}`);
console.log(`Cost: $${stats.totalCost}`);

// List executions
const executions = await zavu.senders.agent.executions.list({
  senderId: "snd_abc123",
  status: "error",
  limit: 20,
});
for (const exec of executions.items) {
  console.log(exec.id, exec.status, exec.errorMessage);
}
```

### Execution Statuses

| Status | Description |
|--------|-------------|
| `success` | Agent generated response successfully |
| `error` | Execution failed (LLM error, tool error, etc.) |
| `filtered` | Response blocked by safety filters |
| `rate_limited` | Provider rate limit exceeded |
| `balance_insufficient` | Account balance too low to process |

## Agents are addressed by their own id

An agent is a standalone object. It can answer on several senders, and it can
exist with none while you build it.

```bash
npx zavudev agents list                 # every agent in the project, with ids
npx zavudev agents list --json
```

```
id                                name        kind   enabled  senders  model
qd75detym58c6has4sfrye3vws8b6ygt  Atlas       voice  yes      1        openai/gpt-4o-mini
qd7ck28evcskdc3xx4wzevtmeh8b6bcm  Pizza Desk  text   no       0        gpt-4o-mini
```

Over REST:

| | |
|---|---|
| `GET /v1/agents` | List, including agents with no sender |
| `POST /v1/agents` | Create standalone — no sender required |
| `GET /v1/agents/{agentId}` | Fetch one |
| `PATCH /v1/agents/{agentId}` | Update |
| `DELETE /v1/agents/{agentId}` | Delete |
| `POST /v1/agents/{agentId}/test` | Run it, return the reply, deliver nothing |

The older `/v1/senders/{senderId}/agent` routes still work, but they resolve a
sender to exactly ONE agent — so they cannot reach an agent that has no sender,
or the second agent on a shared one.

To exercise one tool rather than the whole agent:

| | |
|---|---|
| `POST /v1/senders/{senderId}/agent/tools/{toolId}/test` | Call the tool with your params, return what it answered |
| `GET /v1/senders/{senderId}/agent/tools/{toolId}/test-runs` | The recent runs, newest first |

From the CLI:

```bash
npx zavudev agents tools test <toolId> --sender <senderId> --params '{"orderId":"ORD-4417"}'
npx zavudev agents tools test-runs <toolId> --sender <senderId>
```

The test is synchronous and returns the tool's status, body, and duration, so a
result is evidence the tool ran. A tool that answers with an error comes back as
`run.success: false` and the endpoint still returns 200 — read the field, not the
status. It fires the real webhook, so it has whatever side effects the tool has.

`test-runs` covers manual tests only. A tool called by the agent during a real
conversation is not listed there; for that, `agents executions` shows how many
tools each reply called.

### Connecting senders

```bash
npx zavudev agents senders connect    --agent <agentId> --sender <senderId>
npx zavudev agents senders disconnect --agent <agentId> --sender <senderId>
```

`POST /v1/agents/{agentId}/senders` with `{"senderId": "..."}`, and
`DELETE /v1/agents/{agentId}/senders/{senderId}`.

**A sender answers with at most one agent.** Connecting one that is already in
use returns `400` naming the agent that holds it — the alternative would be an
agent that looks connected and never receives a message.

## Test an agent without sending anything

```bash
npx zavudev agents test --agent <agentId> --message "where is order ORD-001?"
```

Runs the real prompt, model and knowledge base and prints what the agent
*would* reply, plus tokens, latency and how many knowledge chunks were used.
Nothing is delivered, nothing is charged, no execution is logged — safe to run
in a loop while iterating on a prompt.

It also warns about what a dry run cannot prove: an agent that is disabled,
tools its channels will never call, and contact metadata that will exist live
but not here. Treat those warnings as part of the result.

Multi-turn and isolating the prompt from retrieval:

```bash
npx zavudev agents test --agent <agentId> \
  --turn "I need to change my booking" --turn "Sure — which one?" \
  --message "the one on Friday"

npx zavudev agents test --agent <agentId> --message "what do you cost?" --no-knowledge
```

## Delete Agent

```typescript
await zavu.senders.agent.delete({ senderId: "snd_abc123" });
```

## Constraints

- **One agent per sender.** Writes do not enforce it — a second agent can be
  created on a sender — but every read resolves a sender to exactly ONE agent,
  so the extra one answers nothing and is invisible to `agents get`. `zavu
  deploy` warns when it happens.
- System prompt: max 10,000 characters
- Context window: 1-50 messages
- Temperature: 0-2
- Max tokens: 1-4,096
- Tool name: max 100 characters
- Tool description: max 500 characters
- Document content: max 100,000 characters
- Knowledge base name: max 100 characters
- Provider `zavu` doesn't require an API key (uses Zavu-hosted models)
- All other providers require your own API key